COMP 202: Assignment 1
Introduction to programming

Fall Session, 2004

Due date: Monday September 20 at 23:55 on WebCT, 2004

Browsing and WEB CT

Before getting started with the questions, familiarize yourself with the course website, WebCT, and whichever IDE or text editor you will use throughout the course (e.g. JCreator or NetBeans.)

Q1: Your first Java application program (3 points)

In this question you will have to use Java Development Kit (JDK or Java 2 SDK) and an Integrated Development Environment (IDE) to input, compile and run a simple Java application.
If you are using the Computer Science Teaching Labs, JDK should already be installed, and during the tutorials, the TAs will show you how to input, compile, and run a Java application.
In other cases, such as using a home computer, click here for instructions on downloading and using the necessary software (JCreator).
Type the following program in a file called Age.java, modifying the program with your information where indicated: 
// ----------------------------------------------------------
//   Age.java (Application)
//
//   Author:      Yannick Daoudi   
//   Entered by:  -your name here-  -your ID number here-
//   Classes:     Age
//   Date:        January 8, 2004
//   Description: Computing and printing the student's age
//		  at the end of the current year.
//   Bugs:        No known bugs.
// ----------------------------------------------------------
public class Age 
{ 
	public static void main (String[] args)   
	{
		int birth_year;  // student's birth year
		int year; // current year
		int age; // age of student

		// initialize variables
		birth_year = 1980;  // your birth year here
		year = 2004;

		// compute age of student
		age = year - birth_year;

		// print result and good bye message
		System.out.println("You're turning " + age + " this year.");
		System.out.println("Good Bye!");
	}  // main
} // class Age
Compile, and run the program.
Remember to backup your work. Save your work on a diskette regularly and, if you are working in the labs, each time you log off.

Q2: Your first buggy Java application program (7 points)

This question is similar to the previous one and is meant to familiarize you with some basic aspects of Java's syntax and compile time messages that report syntax errors. Follow the instructions given for the previous question to input the program presented below. Note that you should name the project a1q3 and the source code file as Buggy.java. This program has many errors: 
//--------------------------------------------------------
//Buggy.java (Application)
//
//   Author:      Yannick Daoudi   
//   Entered by:  -your name here-  -your ID number here-
//   Classes:     VeryBuggy
//   Date:        September 1, 2004
//
//   Description: This program will estimate the amount 
//                of calories burned every year depending on
//		  the weight of a person and the distance 
//		  travelled everyday by foot or by bicycle.
//   Bugs:        A few.
//--------------------------------------------------------
public class VeryBuggy
{ 
	public static void main (String[] args)   
	{
		
		/* declare variables */
		String name;
		integer weightKg; distance_km; total_Kilometers;
		double factor, calories;
		
		// initialize variables
		name = Jack; //Your name here
		weight_kg = 66;  // your weight here
		distance_km = 12; // average distance you travel on any given day of the year
		factor = 0.5; // approximate number of calories burned per Kg per Km

		/* compute amount of calories burned every year cycling or walking
		totalKilometers = distance_km * 365;
		calories = factor * weight_kg * totalKilometers;

		// print result and good bye message
		System.out.Print("Hi " + Jack + ", you would spend an extra " calories);
		System.out.Print( calories every year by cycling or walking);
		System.out.println(" instead of taking your car.")
		System.out.println("Goodbye + Name + !");
		
} // class buggy
Study this program and try to fix as many errors as you can before you type it in. After fixing the program, compile it. If the compiler reports syntax errors, correct the errors and recompile till no more errors were found. Make a note of each error you correct. Note that by double clicking onto the error message, JCreator takes you to the appropriate place in the source code containing that error. Fix all errors and submit the corrected program. Annotate the source code to show where the errors were. You may annotate by adding comments to the program.

Q3: Your own Java application (10 points)

In this question you will have to create a simple Java application.
This application should ask the user for the approximate distance travelled on any given day of the year, and then compute the amount of CO2 that would be produced by driving a car on that distance every day of the year, as well as the amount of CO2 that would be saved by taking the bus, and by walking/cycling instead.
Motor vehicles are responsible for almost a large portion of annual emissions of carbon dioxide (CO2), the primary global-warming gas. For example, when driving a car, a person produces (approximately) an extra 200 grams of CO2 per kilometers, whereas when taking a bus, a person only produces an extra 40 grams of CO2 per kilometers.
Your program should looking something like the following example: 
Welcome to the CO2 savings calculator!

Enter the average distance travelled on any given day of the year:
12

Driving a car, you would produce an extra 876.0 Kg of CO2 every year.
You can save 700.8 Kg of CO2 every year by taking the bus instead.
You can save 876.0 Kg of CO2 every year by walking or cycling instead.

Thanks for using the CO2 savings calculator, if you'd like to know
what else you can do to help save the planet, visit www.davidsuzuki.org
and take the Nature Challenge. Bye!
Note: you will need to use the Keyboard class for this question.

IMPORTANT instructions:

To submit an assignment you must login to WebCT, choose COMP-202, go the the ``Evaluation and Activity'' folder, and select ``Assignments''. You will see two ``boxes'' called ``BOX'', and ``PROBLEM'' for each assignment. Normally you should select the first one (``BOX''.) A new page will appear. There is an ``Upload file'' button, a ``Remove file'' button and a ``Submit assignment'' button. For each file in your assignment you have to click on the ``Upload file button'', find your file by browsing through the directories on the computer that you are using until you find the desired file, and choose ``OK'' or ``Upload''. Once you have uploaded all of your files, click on ``Submit assignment''. Your assignment will be automatically time-stamped by WebCT. IMPORTANT: You can submit only once. Also, the problem box should be used only on extraordinary circumstances. In such cases, e-mail your course instructor about it. After submitting your assignment make sure to keep a backup copy for your records. We are very careful with assignments, but sometimes assignments do get misplaced. Clearly indicate in the source code of every file of your assignment, using comments, the following information:
1.Name: ...
2.ID number: ...
3.Course number: ...
4.Section number: ...
6.Assignment number: ...
7.Where you developed your program: (i.e. at home, in the CS lab, in the Engineering lab ...)

All assignments are due at 23:55 on WEB CT. Also please remember the policy on cheating as described in the course outline. You must do this assignment by yourself.

MARKING Section

Every assignment will have a marking scheme section. This is provided to help both the student and the TA. It provides direction for how the assignment should be graded by the TA. Note that for all questions Formatting the code nicely and providing comments is mandatory.